/*---------------------------------------------------------------------------*\
OneFLOW - LargeScale Multiphysics Scientific Simulation Environment
Copyright (C) 2017-2019 He Xin and the OneFLOW contributors.
-------------------------------------------------------------------------------
License
This file is part of OneFLOW.

OneFLOW is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

OneFLOW is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with OneFLOW.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/
#pragma once
#include "Configure.h"
#include "HXDefine.h"
#include <fstream>
using namespace std;

BeginNameSpace( ONEFLOW )

class DataBook;

class VirtualFile
{
public:
    VirtualFile( fstream * file );
    VirtualFile( DataBook * databook );
public:
	int type;
	fstream * file;
    DataBook * databook;
public:
	streamsize sectionBegin, sectionEnd, dataLength;
public:
	void Read ( void * data, streamsize size );
	void Write( void * data, streamsize size );
protected:
	void MarkSectionBegin();
	void MarkSectionEnd  ();
	streamsize GetSectionBegin() { return sectionBegin; };
	streamsize GetSectionEnd() { return sectionEnd; };
	void MoveToPosition( streamsize sectionPosition );
	void MoveToSectionBegin();
	void MoveToSectionEnd();
	void WriteDataLength();
public:
	void BeginWriteWork();
	void EndWriteWork();
	void BeginReadWork();
	void EndReadWork();

	void ReadDataLength();
	void ReservePlaceholder();
	streamsize GetCurrentPosition();
};

EndNameSpace
